Fairlight-CMI

Does anyone know what the numbering scheme is for serial numbers on Fairlights? I can see there is a pattern with the alpha part of the serial numbers where SNA is the CPU, SNB is the Monitor, SNC is the alpha keyboard, and SND is the music keyboard. 

What about the numeric part of the serial numbers? Here are my numbers, for example:

CPU serial number is SNA108050
Monitor is SNB108051
alphanumeric keyboard is SNC0783198
master keyboard is SND0783198

It doesn't look like there is an obvious manufacture date encoded in them and it doesn't look like they are purely sequential serial numbers based on the numerical order of production. I know Roland has some sort of month/year of manufacture encoded into their old serial number scheme - is there something like that going on here?

Does anyone have a clue as to how they numbered them?

Thanks!
Kirk